FI69870C - FOERFARANDE FOER ANORDNING FOER BEHANDLING AV ETT GRUSLIKNANDEMATERIAL MED ETT FLUIDIUM - Google Patents

Description

69870

This invention relates to a method and apparatus for treating gravel, solids such as ores, crushed minerals and coal with a liquid in a tank, in which the gravelly solid is fed to the lower end of the tank and gradually raised upwards through the tank. . Po. the invention relates in particular, but not exclusively, to a bath suitable for lye dissolving minerals or the like. By gravelly material is meant herein crushed minerals, ores or carbons, as well as concentrates in grain sizes.

Such processes use strong acids with relatively high temperatures. Due to the use and consumption of strong and / or relatively hot acids to which the container and its equipment are exposed, high demands are placed on the equipment used. Therefore, a simple, strong and "maintenance-free" 20 equipment is needed. In addition, there is a need for equipment that allows for the most rational and economical handling possible.

In lye leaching of ore or similar, the ore is usually treated with acid in a vessel or bath until the desired mineral / metal separation is achieved. The vessel 25 is then emptied of both gravel and acid, after which a new batch of ore and acid is fed into the vessel.

In addition, it has been proposed to mix liquids and finely ground ore so that the mixture can be pumped by means of sludge pumps and the like. In such a solution, the amount of excess fluid 30 has increased significantly beyond what is necessary for the process itself. Excess treatment liquid is fed in solely to allow the transport of said finely ground substance. Therefore, a very large quantity must be transported. In a particular process 35, which also includes po. the solution of the invention is suitable, it is a question of transporting about 150 m of gravelly dry matter per hour. In order to be able to pump such a quantity of dry matter per hour, it is necessary to use the liquid several times in relation to the amount of dry matter.

The two previously known treatments are therefore not very economical or desirable from a commercial point of view.

In addition, it is known from practical experiments and mathematical calculations that it is very difficult and almost impossible to press a gravel-like substance through a vertical pipe unless the length of the pipe is less than its diameter. This is due to the combined effect of the horizontal forces of the substance on the pipe wall and the friction.

Po. The object of the invention is to develop a solution which enables the continuous processing of a solid, gravelly substance and, in addition, the transport of large quantities of ore or the like without the introduction of excess liquid. In addition, the goal is to develop a solution based on the so-called. "countercurrent principle", i.e. moving the solid in the opposite direction to the treatment liquid or substance. In addition, the aim is to allow the gravelly substance to move upwards in a high, narrow, cylindrical vessel.

The present invention is characterized in that the gravelly solid is fed into the container through a centrally located rotatable hollow tube having one or more lifting members fitted thereto, the gravelly solid being led out of the rotating hollow tube into the container through one or more openings at the lower end of the tube.

Preferably, said fluid is introduced into the top of the vessel at a level below the level at which the gravelly solid is caused to exit the vessel, allowing the gravelly solid to remain dry in the vessel so that said fluid or liquid can drain therefrom.

In one embodiment, the gravelly solid 35 is introduced into the vessel through a stationary, central, hollow and rotatable tube to which one or more lifting members are connected, said gravelly solid 3 69870 being discharged from said hollow tube through one or more openings in its wall, and distributed evenly by means of said lifting parts.

According to another preferred embodiment, said lifting parts comprise at least one diagonally arranged wing, the lower edge of which rotates in the plane of the bottom of the container and which is inclined upwards and backwards in the opposite direction to the direction of rotation. Below the wing (s) there is a channel which is open along the entire length of the wing-10 la and is formed by the bottom and side walls of the vessel and the oblique wing. The channel is in open communication with the hollow shaft through openings in the tubular wall for the distribution of a gravelly solid.

In a particularly preferred embodiment, said lifting parts comprise two oblique vanes which are directly opposite each other with respect to the tube. These oblique wings are further located tangential to the hollow center tube.

Po. the invention is based on the countercurrent principle, i.e.

In this case, the solid, gravel-like substance is made to move upwards, while the treatment liquid is made to move in the opposite direction, i.e. downwards. Po. according to the invention, it is possible to move the gravelly solid upwards in a vessel, where the diameter of the vessel can be less than its height. In addition, a solution has been developed in which the upwardly moving, gravel-like solid is additionally distributed evenly over the entire bottom surface of the vessel.

The following describes po. a further embodiment of the invention with reference to the figures, in which: Fig. I shows a completely schematic, vertical sectional view po. a container according to the invention; Fig. II shows a horizontal sectional view of the container and lifting part of the invention along the line F-F in Fig. I; Fig. III shows a vertical sectional view of one half of the container and the second lifting part along the line E-E in Fig. II; 4 69870 Fig. IV is a vertical sectional view taken along line A-A of Fig. II;

Fig. V shows a vertical sectional view of the second lifting unit along the line B-B in Fig. II; Fig. VI shows a vertical sectional view of the lifting unit along the line C-C in Fig. II; and Fig. VII shows a vertical sectional view of the lifting unit along the line D-D in Fig. II.

The embodiment shown in Figures I-VII is intended for lye leaching of gravelly ore in which the lye consists of concentrated hydrochloric acid having a temperature above 100 ° C. Hydrochloric acid is in this case a catalyst whose high thermal energy recovery is desirable.

According to Figure 1, the process equipment consists of a vessel 1, preferably with a circular cross-section. In the middle of this vessel 1 is placed a hollow cylinder 2, the upper end of which communicates with an ore feeder (not shown). Cylinder 2 is open at both its upper and lower ends. At the lower end, the cylinder 2 is further connected to two lifting parts 3, only one of which is shown in Figure 1. Said lifting part 3 is formed by wings 5 arranged obliquely with respect to the bottom 4 of the container. The lifting parts 3 are arranged directly opposite each other and with respect to the central tube 2. In addition, the lifting parts 3 are arranged tangentially to said central tube 2. In addition, the lifting parts 3 are arranged tangentially to said central tube 2.

The lifting parts 3 shown in the figures are designed to rotate clockwise in the container 1. In order to obtain the desired lifting effect, said vanes 5 are arranged so that their lower edge 6 rotates in the plane of the bottom of the container and the vanes 5 are obliquely upwards and backwards with respect to the direction of rotation. In this embodiment, the vanes 5 operate like a double-wing propeller. The length of the lifting part 3 is slightly 35 smaller than the diameter of the vertical container 1. When the lifting part 3 is made to rotate through the tube 2 5 69870 on the shaft of the vessel 1, the lifting part 3 tends to rotate downwards towards the bottom 4 of the vessel 1.

The rear edge 7 of the wings 5 is preferably open along the entire length of the wing 5. This forms a channel 9 which is open 5 towards the rear edge 7 of the wing 5, but which is otherwise bounded by the bottom 4 of the vessel 1 and the oblique wing 5. Said channel 9 is in open communication with the central tube 2 through an opening 10 in the tube wall at the lower end. Alternatively, the wings 5 can be provided at their rear edge 7 with a vertical plate 10a which is fixed to the rear edge 7 of the wing 5 so as to reduce the opening 13 at the rear edge 7 of the wing without still reducing the rise of the wing 5.

According to Fig. II and Figs. V-VII, the height of the opening 13 of the channel 9 decreases as seen from the pipe 2 and towards the outer ends of the sii-15.

To reinforce the lower end of the pipe 2, it is provided with a pipe nozzle 11 having a larger diameter than pipe 2. The pipe nozzle 11 terminates at the upper end in the form of a horizontal plate 12 closely surrounding said pipe 2 as well as pipe nozzle 11. The wings are rigidly attached to said pipe nozzle 11 Said opening 10 is at a suitable point in the wall of the pipe nozzle 11.

Said tube 2 with its wings 5 can be mounted in the container 1 in any suitable way and rotated 25 by means of a suitable motor and transmission parts (not shown), e.g. placed at the upper end of the tube. In addition, similar lifting parts can be placed at different heights of the pipe to improve the lifting efficiency.

The procedure is described in more detail below in the figures in Reference 30.

The tube with 2 wings is made to rotate. The gravel-like solid is introduced into the vessel 1 at this bottom via a hollow tube 2, while hydrochloric acid is fed through an inlet tube 14.

35 The lifting part 3 now moves around in a container 1 filled with gravel, solid and liquid. During rotation, the oblique wing 5 lifts up a gravel-like, 6 69870 solid and moves it up along the oblique surface of the wing. In this case, a space without gravel-like material is formed in the channel 9 below the wing 5, to which a new space of new gravel-like material is fed from the vertical put-5 housing 2 through this opening 10 in the wall. When the lifting part has moved around 360 °, the bottom of the gravel column in the vessel 1 has moved twice the rise of the blade 5, while new gravel has been fed under the blades 5. This is because the lifting part contains two silo heads 5.

At the upper end of the gravelly column, this is observed only as a wave coming twice per revolution of the lifting part.

As an example, if the lifting part consists of two wings, each with a width of 6 cm and a pitch of 2 cm, and the plate 8 is placed downwards from the upper (and rear) edge of the wing at a height of 1 cm, the size of the slit opening 13 is 1 cm.

By feeding a gravelly solid to a rotating shaft consisting of a tube 2, the gravelly solid becomes displaced outwards in the channel 9 formed under each oblique wing 5 due to the radial movement of the wings 5. During this further rotation, the vertical plate 8 on the rear edge 7 of the wings 5 causes a new layer of gravel-25 to be lowered onto the bottom 4 of the vessel 1 with a thickness corresponding to the height of the slit opening 13. Ko. in the exemplary embodiment, this gap 13 is given a height of 1 cm.

The amount of gravelly solid previously fed inside, which has been raised by the oblique wing 5 to a level 30 corresponding to the plane 7 at the rear edge 7 of the oblique wing 5, cannot now fall a corresponding distance back behind the wing 5, but only by a distance approximately to the rear of the wing 5 the height of the placed vertical plate 8. This is due to the fact that in the meantime a new layer of gravel-like solid has been fed through the channel 9, the height of which corresponds substantially to the height of the gap 13, and that the raised gravel-like mass thus falls down on top of this layer.

7 69870

In theory, the gravel column rises twice the said height of the gap for each full revolution of the lifting section. In practice, however, the rise is not so great because the gravel-like solid enters the system in the unclosed state.

While the gravelly solid is made to move upwards in the vessel, hydrochloric acid is fed into the vessel 1 at the upper end through the inlet 14 and discharged at the lower end of the vessel 1 through the outlet 15. During the discharge, a sufficient amount of new acid is fed down through the inlet 14, corresponding to the amount of acid discharged and the possible amount of waste that may occur in connection with the removal of the gravelly solid. This results in a continuous process, which is very advantageous.

Po. according to the invention, it is advantageous to feed the acid at a level in the vessel 1 below the upper end of the vessel 1, so that the gravel-like solid leaves the continuous liquid surface at a certain distance from the upper end of the column. The gravelly solid thus obtains a "dry" residence time in the vessel 1, so that the acid can drain out of it before the scraper or the like (not shown) removes the solid, pre-treated substance at the top of the vessel 1.

Claims (10)

69870 A method for treating a gravelly solid such as ores, crushed minerals and carbon material with a liquid in a tank, wherein the gravelly solid is fed to the lower end of the tank and gradually raised through the tank by a rotating lifting member, characterized in that the gravelly solid is fed into the tank through a rotatable hollow tube having 10 or more lifting members fitted thereto, the gravelly solid being led out of the rotating hollow tube into the container through one or more openings at the lower end of the tube. A method according to claim 1, characterized in that the liquid is brought to the upper end of the tank at a level below the level at which the gravelly solid is discharged from the tank, the gravelly solid having a dry residence time in the tank so that the liquid can drain out . Method according to claim 1 or 2, characterized in that the gravelly solid is distributed evenly on the bottom of the container by means of said one or more lifting members, said lifting member lifting part of the gravelly solid already fed into the container, introducing new material below the lifting member. An apparatus for treating gravel-like solids, e.g. ores, crushed minerals and carbons, with liquid in a tank (1), comprising means for feeding, transporting and removing gravel-like solid, and means for feeding and removing liquid, characterized in that the gravel-like solid the feeder is a rotating vertical hollow tube (2) centrally arranged in the tank (1), the tube being provided at its lower end with one or more openings through which the gravelly solid can be fed into the tank (1) and the tube. (2) at least one lifting member (3) is arranged in the lower part, which is intended to gradually lift the gravel-like solid upwards into the tank. Device according to claim 4, characterized in that the horizontally rotating lifting member (3) comprises an inclined wing (5) adapted to rotate about a vertical axis. Device according to Claim 4 or 5, characterized in that the lower edge of the inclined wing (5) is adapted to rotate in the plane of the bottom (4) of the container (1), the inclined wing (5) tilting upwards and backwards, viewed against the direction of rotation. Device according to Claims 4 to 6, characterized in that a vertical plate (8) is mounted on the upper edge of the rotating wing (5) and extends downwards from the upper edge, the height of the plate (8) being less than that of the upper edge of the wing (5). and the distance between the bottom (4) of the container (1), whereby a gap (13) is formed behind the wing (5). Device according to Claims 4 to 7, characterized in that a channel (9) is formed below the wing (5), which is delimited by inclined wings (5), the bottom of the container (1) and possibly a vertical perpendicular plate (8). . Device according to Claims 4 to 8, characterized in that the two lifting elements are arranged diametrically opposite each other with respect to the hollow tube (2). Device according to Claims 4 to 9, characterized in that the two oppositely arranged lifting members (3) are located tangentially to the centrally arranged hollow tube (2). 10 69870